REXROTH VT-VRPA1-51-11 Proportional Valve Amplifier

Description

REXROTH VT-VRPA1-51-11 Proportional Valve Amplifier

Product Dimensions：

The Rexroth VT-VRPA1-51-1X (where 11 denotes a specific version of the 10-series) is an analog proportional amplifier in Eurocard format. It is specifically designed to control proportional pressure control valves without electrical position feedback.

Product Detailed Description

The VT-VRPA1-51-11 module serves as the electronic interface between a control system (PLC) and a proportional valve. It converts a standard voltage command signal into a pulse-width modulated (PWM) current. This current drives the valve’s solenoid, ensuring that the hydraulic pressure or flow is precisely proportional to the input signal. The “51” designation indicates that it is specifically tuned for valves without a position transducer (open-loop control).

Technical Parameters

Product Advantages

• Precision Control: Features a regulated output stage that maintains constant current regardless of solenoid temperature fluctuations.
• Customizable Dynamics: Integrated Ramp Generator allows for independent adjustment of the pressure rise and fall times, preventing hydraulic shocks in the system.
• Dither Function: Includes an adjustable dither signal to reduce “stiction” (static friction) in the valve spool, significantly improving hysteresis and resolution.
• Diagnostic Features: Equipped with front-panel test points for measuring the command value and the actual solenoid current without disconnecting the wiring.

Important Considerations (Precautions)

• Power Supply Ripple: Ensure the 24V DC power supply is smoothed; the rectification ripple should be less than 5% to avoid interference with the PWM output.
• Shielding: Signal cables (command values) must be shielded, and the shield should be grounded only at the amplifier side to prevent ground loops.
• Load Matching: The maximum output current must be calibrated using the onboard potentiometer to match the specific solenoid’s rating to prevent burnout.
• Installation: As a Eurocard module, it requires a card holder or a 19-inch rack (e.g., VT 3002). Ensure adequate ventilation, as the power transistors generate heat during high-duty cycles.

Product Applications

This amplifier is used in industrial hydraulics where precise, repeatable pressure control is required:

• Plastic Injection Molding: Controlling the clamping and injection pressure phases.
• Metal Forming Presses: Regulating the force applied by hydraulic rams in punching or bending machines.
• Machine Tools: Managing the clamping force of hydraulic chucks or the movement of auxiliary axes.
• Paper & Steel Mills: Tension control and roll positioning where robust, analog-driven hydraulic force is necessary.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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